Problems with Word 2002 in XP - error messages

I keep getting error messages in Word 2002 when I open it up, and also when I close it. When starting the program, I get the message: "This file contains macros with an expired or revoked signature. Since you are running under High Security Level, these macros will be disabled." This is followed by a Microsoft Visual Basic message: "The macros in this project are disabled. Please refer to the online help of documentation of the host application to determine how to enable macros".